<div class="row">
  <div class="col-xs-3 col-sm-3">
  	<a class="item" ng-href="/#/home">首页</a>
  </div>
  <div class="col-xs-3 col-sm-3">
  	<a class="item" ng-href="/#/signin">登录</a>
  </div>
  <div class="col-xs-3 col-sm-3">
  	<a class="item" ng-href="/#/signup">注册</a>
  </div>
  <div class="col-xs-3 col-sm-3">
  	<a class="item" ng-href="/#/signout">登出</a>
  </div>
</div>
